Keyphrases
- information retrieval
- information retrieval systems
- search engine
- information access
- information extraction
- document retrieval
- document collections
- information filtering
- learning to rank
- retrieval effectiveness
- test collection
- question answering
- query expansion
- text mining
- retrieval systems
- language model
- retrieval model
- relevance feedback
- human actions
- feature selection
- vector space model
- real time